Adb server is out of date.... Please help

hey wassup good people. im trying to use the one click root method for the epic. im not to familiar with adb and the other ways of rooting. so im sitting here trying to follow the youtube video on the one click root but keep coming up with that error in the dos prompt "adb server is out of date".

so if anyone out there can lend the slow people such as myself a hand that would be greatly appreciated.